Precipitation return levels in Finland

The precipitation return levels presented in the tables can be used for risk assessment of abundant precipitation and the use of design rainfall. The values have been calculated for those weather stations of the Finnish Meteorological Institute from which long (typically over 50 years) and reliable time series can be obtained. When applied to other locations, one should select the weather station which is climatically closest, which, in practice, usually is the nearest station. The calculated values are based on observations which means that the predicted impacts of climate change are not included.

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Return levels for precipitation of six hours at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.

ret.period1201 Jokioinen observatory7501 Sodankylä
years95%avg.95%95%avg.95%
10314456212633
20385469232937
50507192253342
1006086112263647
500---304357

 

Return levels for precipitation of 24 hours at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.

ret.period304 Helsinki Kaisaniemi1101 Turku airport1201 Jokioinen observatory1501 Utti airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10475566475564485767424856
20526476536475546780465463
50607692627691658298516374
100688610571871047595115567083
50089115141941181421041331627088105

 

ret.period2401 Jyväskylä airport3201 Kauhava airport3801 Joensuu airport5401 Oulu airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10465464445161455261384554
20526375496072506072425363
50617692567188597388506477
100698810666841016784101577389
500---8811413990115140---

 

ret.period6801 Kuusamo airport7501 Sodankylä8201 Muonio kk9601 Ivalo
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10374351353945435161435364
20415060384350496072506478
504860734249575772876382100
1005469 -44546365831007598121
500---53657686111136---

 

Return levels for precipitation of five days at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.

ret.period304 Helsinki Kaisaniemi1101 Turku airport1201 Jokioinen observatory1501 Utti airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
107585100728091707965747683
20859712680901117890124798292
509611216089102142891061548487105
1001031221799511015796119-8790116
500116144219105125186110--9195127

 

ret.period2401 Jyväskylä airport3201 Kauhava airport3801 Joensuu airport5401 Oulu airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10727683---728296535866
20778294---8294119586478
508390113---93107156647198
1008794124---1001161726775106
50093101137---111133-7182121

 

ret.period6801 Kuusamo airport7501 Sodankylä8201 Muonio kk9601 Ivalo
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10---576372606778627289
20---6371896675977183117
50---718211174861208297148
100---7791126809413488107166
500---87109-9011216598128205

 

Return levels for precipitation of fourteen days at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.

ret.period304 Helsinki Kaisaniemi1101 Turku airport1201 Jokioinen observatory1501 Utti airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10119126137116127143115119129111116126
20126135161127141171123128141118124140
50134144-140156-130135157125131161
100138149-148166-134139169128135179
500144156-159184-139145190133142190

 

ret.period2401 Jyväskylä airport3201 Kauhava airport3801 Joensuu airport5401 Oulu airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10104112123----122134838896
20112122142----1301448894106
50121133169----13716194101121
100127141183----14017497105133
500138157210----144198102112145

 

ret.period6801 Kuusamo airport7501 Sodankylä8201 Muonio kk9601 Ivalo
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10981011098994101911011188799120
2010410712194100112100113-98113-
5010811314199107131112130-111131-
100111115151101110141119142-119144-
500114119158106116151132--133--

 

Return levels for precipitation of a month at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.

ret.period304 Helsinki Kaisaniemi1101 Turku airport1201 Jokioinen observatory1501 Utti airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10144149157138148158-141148144153165
20155162171147161173-149157153164182
50166175190157175195-157169162174204
100172182204164183213-161177167180221
500183194233175198242-166195174188245

 

ret.period2401 Jyväskylä airport3201 Kauhava airport3801 Joensuu airport5401 Oulu airport
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10145151163---149157171110124146
20155162178---162171191124142179
50164172198---175186216141164221
100172178212---183195235153180246
500180186239---195208267---

 

ret.period6801 Kuusamo airport7501 Sodankylä8201 Muonio kk9601 Ivalo
years95%avg.95%95%avg.95%95%avg.95%95%avg.95%
10-131138119124132-131138114121132
20-139148127133144-139147123131146
50-148162136144160-146157131141166
100-153173141150173-149163135146182
500-160193150160195-153173143155202

 

Reference:

Venäläinen, A., Saku, S., Kilpeläinen, T., Jylhä, K., Tuomenvirta, H., Vajda, A., Räisänen, J. & Ruosteenoja, K. 2007. Sään ääri-ilmiöistä Suomessa. (Aspects about climate extremes in Finland. Abstract in English.) Ilmatieteen laitos, Helsinki. Ilmatieteen laitoksen raportteja 2007:4. 81 s. http://hdl.handle.net/10138/1138 

More information in Climateguide.fi:

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Precipitation will increase and heavy rain events will intensify

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